Metallic packing for pistons



A. SCHULTZ, J. R. TUCKER, AND R. I. DOYLE.

METALLI-C PACKING FOR PISTONS.

APPLICATION FILED JAN-8,1921.

1,413,791. Patented Apr. 25, 1922.

llill it I I I J 1 1 :'1:' .nm

ALFRED SCHULTZ, JAMES ROBERT TUCKER, AND REDMOND I. DOYLE, OF BALTIMORE,

. MARYLAND.

METALLIQ PACKING FOR PISTONS.

To all whom it may concem:

Be it known that we, ALFRED SCHULTZ,

JAMES R. TUCKER, and REDMOND I. DOYLE, citizens of the United States, residin at Baltimore, in the county of Baltimore ity and State of Maryland, have invented certain new and useful Improvements in Metallic Packing for Pistons; and we do hereby declare the following to be a full, clear, and exact description of the. invention,

such as will enable others skilled in the.

art to which it appertains to make and use the same.

Our invention relates to improvements in metallic packing'for pistons, and is especially intended to provide a suitable packing for use with internal combustion engines,.

. course, essential to keep the piston lubricated, and at the same time it isalso desirable toprevent the passage of the oil from the open to the closed end of the cylinder.

Our invention comprises a particular arrangement whereby the piston is made substantially gas-tight, and at the same time this assage of the oil from the open to the clbsed end of the cylinder is in a large measure prevented.

Our invention will be more fully understood after reference to the accompanying drawings, in which like parts are indicated by similar reference symbols throughout the several views, and in which Figure 1 shows the piston in elevation, partly broken away, and the adjacent parts of the cylinder in section.

Figure 2 shows a section along the line 22 of Figure 1, and looking in the direc-' tion of the arrows, part of the ring being broken away to show the construction of the lower portion of the piston.

Figure 3 is an enlarged detail view of parts shown in Figure 1; and

Figure 4 shows a portion of the lower packmg ring as used m our invention. I

Specification of Letters Patent.

A represents the cylinder which may be of any suitable or deslred construction, preferably provided with a jacket A and with passages A for the coolingvmedium.

B represents the piston which may be made of the usual standard type, and to which the piston rod C is connected in the usual way. This piston is preferably in the form of an inverted cup, having the side walls B and the closed end B The piston is provided with one or more annular grooves b, b" and b for the packing rings, three of which are shown. Theipiston 'is also reducedin diameter slightly, as at If, to form an annular channel B in which the .oil accumulates, as will be hereinafter described, and in rear of this channel B the diameter of the piston is brought to the standard by means of a flange B which has longitudinal grooves b therein to permit the outflow of the oil from the channel B down through the open end of the cylinder, as will be hereinafter more fully described.

The packings rings D and D are preferably of the usual rectangular construction, with the L-shaped interlocking ends d", as shown, and the lower ring D is preferably made of special cross section as shown most clearly in Fi res 3 and 4, in which (Z is an ,annular shou der forming a bearing face for the lower edge of the ring against the corresponding wall of the ring grove b Extenor to this annular shoulder 03 is the annular groove d which is, in cross section, in

Patented Apr. 25, 1922. Application filed January-8, 1921. Serial No. 435,862. I l

the form of an arc of a circle, terminating in the sharp scraping edge 0Z In operation, the rings D and D exercise the normal function of maintaining a substantially as-tight joint between the piston and the cy inder, which function is supplemented by the ring D which latter ring ,has an added function in that the annular scraping edge d tends to scrape the oil from the inner walls of the cylinder and direct it into the annular channel B". As the piston descends, this oil so scraped off accumulates in the channel B and falls down through the passages 12 The oil is supplied to the interior of the cylinder through the open end in the usual way.

It will be noted that as the ring D wears on its outer face, the edge d will always be ground sharp, so that no matter whether the ring wears or not this edge will be kept .rings may be increased or decreased as desired, or in exceptional cases a single packing ring D may be used, the other rings D and D being omitted;

It will be obvious that variousother modifications might be made in the construction, combination and arrangement of parts which could be used without departing from the spirit of our invention; and we do not mean to limit the invention to such details except as particularly. pointed out in the claim.

Having thus described our invention what We claim and desire to secure by Letters Patent of the United States is I In a metallic packing for pistons, the combination with a piston provided with an annular groove 'near the base thereof, said groove being rectangular in cross section, said piston being also provided with a, relatively wide imperforate annular channel,

in rear of said groove, and with a flange in' terminating -1n an annular sharp scrap ng.

edge, the major portion of said arcuate groove projecting beyond the bottom of said tially as'and for the purposes described.

ALFRED SCHULTZ. JAMES ROBERT TUCKER REDMOND I. DOYLE.

channel while the ring is in use, substan' 

